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SOUTHERN REGIONAL GRID

SOUTHERN REGIONAL GRID. ▀ Centre Generating Stations in the Region are Ramagundam Super Thermal Power Stn. : 2,600 MW (200x3 + 500x4) Neyveli Lignite Corporation Ltd. - II : 1,470 MW (210 x 7) Madras Atomic Power Station : 340 MW (170 x 2)

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SOUTHERN REGIONAL GRID

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  1. SOUTHERN REGIONAL GRID • ▀ Centre Generating Stations in the Region are • Ramagundam Super Thermal Power Stn. : 2,600 MW (200x3 + 500x4) • Neyveli Lignite Corporation Ltd. - II : 1,470 MW (210 x 7) • Madras Atomic Power Station : 340 MW (170 x 2) • Kaiga Atomic Power Station : 440 MW (220x2) • NLC EXPANSION TPS 1 : 420 MW (210X2) • TALCHER STAGE II : 1500 MW (500X3) present in ER • ▀ Beneficiaries in southern Region are • . ANDHRA PRADESH • KARNATAKA • KERALA • TAMIL NADU • Union Territory of Pondicherry • NLCMINES • GOA has share of 100MW from RSTPS

  2. CONTROL AREAS CS - 2 CS - 1 CS -3 REGIONAL GRID RLDC COORDINATES SEB - A SEB -B SEB -C STATE IPP STATE GENR CENTRAL SHARE SEB’S GRID SLDC COORDINATES DIRECTS DISTR - A • DISTR • B DISTR - C

  3. C H A P T E R - 7 SCHEDULING & DESPATCHING CODE Demarcation of Responsibilities . Each Region is a loose power pool and each state is a notional Control Area. (Decentralized Scheduling and Dispatch) . RLDC can direct SLDCs/ISGSs in case of system contingencies, to change drawal/injection and if time permits, RLDC will ascertain whether situation has arisen due to => Deviations from schedule => Bilateral Exchange These can be terminated by RLDC. . All joint/bilateral agreements to be filed with RLDC/REB Secretariat . SEMs to be installed by CTU at all interconnection points for recording Actual Interchanges and MVARh drawals. . Regional Energy Accounting to be done by REB Sectt.based on metered and processed data (Actual net injection of ISGS and actual net drawal of each beneficiary) received from RLDC . SRLDC/Comml/IEGC/33

  4. Settlement Systems* • . Accounting on weekly basis • . Capacity and Energy Charges billing on monthly basis • Billing of adjustments for deviations on weekly basis • RLDC to furnish data to REB Secretariat by Thursday noon for week ending Sunday • . REB Secretariat to finalize and issue REA by Tuesday, for seven day period ending on penultimate Sunday • . All data to be retained for 20 days (for RLDC & REB) for verification. • Commercial Mechanism * • Availability Based Tariff • ( a) Capacity Charge • (b) Energy Charge • (c) Adjustment for Deviations SRLDC/Comml/IEGC/34

  5. Scheduling Process On Day-l SRLDC/Comml/IEGC/41

  6. On Day 0 On Day + 1 . RLDC to issue before-the- fact Capacity Declaration/Schedules finally implemented by RLDC (Datum for accounting and working out average ex-power plant capability). SRLDC/Comml/IEGC/42

  7. Scheduling Process • Scheduling for the next day • • Every day by 10 AM, RLDC collects the foreseen plant-wise ex-power plant MW capability of ISGSs for the next day • • By 11 AM, RLDC advises SEBs, on a 15 minutes blockwise level, their entitled MW shares from each ISGSs’ availability • • By 3 PM, RLDC receives block-wise MW requisition from SLDCs and also the schedule of bilateral exchanges, if any • • By 5 PM, RLDC issues ‘despatch schedules’ for ISGSs and ‘net drawal schedules’ for SEBs, 15 minutes block-wise for the next day starting at midnight. • • Upto 10 PM SLDCs may inform any change of the above or bilateral exchanges to RLDC, if required by any new development during the day. • • At 11 PM Schedules are frozen for the next day. RLDC issues final drawal schedules to each State & Despatch schedule to each ISGS.

  8. 1000 MW Forecast ex-bus capability of power plant 800 600 SEB - A’s entitlement (40%) 400 200 0 0 6 12 18 HRS 24 Declared Capability for which Capacity charges Are recieveable by ISGS Gen.Sched. for which Energy charges Are recieavable by ISGS Schedule for which Energy charges Are payable by SEB- A Entitlement for which Capacity charges Are payable by SEB-A

  9. Scheduling Process • Any change of schedule for the current day • In case of any forced outage of a unit, or in case of any transmission bottleneck or in the interest of better system operation, RLDC may revise • the schedules. The revised schedules will become effective from the 4th time block. • ISGSs and/or SLDCs may also revise their schedules during a day. The revised schedules will become effective from the 6th time block.

  10. REVISION OF SCHEDULES/REQUISITIONS OUTAGE OF GENERATING UNIT REVISED DECLARATION OF AVAILABILITY BY ISGS OUTAGE OF A TRANSMISSION ELEMENT UNFORESEEN LOAD-CRASH TAKES EFFECT FROM 4TH TIME BLOCK IN CASE OF FORCED OUTAGE OF A GENERATING UNIT TRANSMISSION CONSTRAINT GRID DISTURBANCE SUO MOTO BY RLDC B) 6TH TIME BLOCK IN CASE OF REVISION OF DECLARED AVAILABILITY BY ISGS - REVISION OF REQUISITIONS BY BENEFICIARIES

  11. REACTIVE ENERGY CHARGE : PAYABLE FOR : 1. VAR DRAWALS AT VOLTAGES BELOW 97% • VAR INJECTION AT VOLTAGES ABOVE 103% RECEIVABLE FOR: 1. VAR INJECTION AT VOLTAGES BELOW 97% • VAR DRAWAL AT VOLTAGES ABOVE 103% APPLIED FOR VAR EXCHANGES BETWEEN : A) BENEFICIARY SYSTEM AND ISTS - THROUGH A POOL ACCOUNT B) TWO BENEFICIARY SYSTEMS ON INTER-STATE TIES - BY THEMSELVES RATE: APPLIED @ 4 paise/kvArh ( UPTO 31.3.01 ) WITH 5% ESCALATION PER YEAR

  12. Regional Energy Account & Settlement System • Capacity and Energy Charges billing on monthly basis • Settlement of adjustments for deviations ( UI) on weekly basis • RLDC to furnish data to REB Secretariat by Thursday noon for previous week ending Sunday • REB Secretariat to finalize and issue REA by Tuesday, for seven day period ending on penultimate Sunday • All accounts open for 20 days for verifications and clarifications

  13. THANK YOU SRLDC/Comml/IEGC/47

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